\begin{{tabular}}{{l p{{2mm}} c c}}
    \toprule
     & & (1) & (2) \\
     & & \multicolumn{{1}}{{c}}{{Complexity}} & \multicolumn{{1}}{{c}}{{Complexity}}  \\
    \cmidrule{{1-1}} \cmidrule{{3-4}}
    Proportion of production - natural gas & & {prop_0} & {prop_1} \\
         & & ({se_prop_0}) & ({se_prop_1})\\
    \midrule
    Time FEs & & No & Yes \\
    \midrule
    N & & {n_0} & {n_1} \\
    \bottomrule
\end{{tabular}}